Columbia 1943 Record Catalog (records issued up to and including November 1942):
Highest numbered sets: M-523, X-229, Op. 22, C-91, J-24, E-11 and S-61.
Deletions since the 1942 catalog: M-50, 51, 52, 73, 75, 77, 91, 103, 111, 118, 125, 131, 135, 139, 152, 158, 165, 188, 199, 201, 202, 225, 253, 268, 296, 299, 306, 311, 317, 326, 341, 348; X-14, 23, 40, 46, 47, 48, 56, 84, 97, 99, 101, 104, 105, 106, 109, 112, 117, 119, 126, 128, 129, 130, 131, 147, 175; C-1, 2, 5, 9